1 /* xscreensaver, Copyright (c) 1992, 1995, 1997, 1998
2 * Jamie Zawinski <jwz@jwz.org>
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation. No representations are made about the suitability of this
9 * software for any purpose. It is provided "as is" without express or
12 * And remember: X Windows is to graphics hacking as roman numerals are to
13 * the square root of pi.
16 /* This file contains simple code to open a window or draw on the root.
17 The idea being that, when writing a graphics hack, you can just link
18 with this .o to get all of the uninteresting junk out of the way.
20 - create a procedure `screenhack(dpy, window)'
22 - create a variable `char *progclass' which names this program's
25 - create a variable `char defaults []' for the default resources, and
28 - create a variable `XrmOptionDescRec options[]' for the command-line,
29 and null-terminate it.
35 #include <X11/Intrinsic.h>
36 #include <X11/IntrinsicP.h>
37 #include <X11/CoreP.h>
38 #include <X11/Shell.h>
39 #include <X11/StringDefs.h>
40 #include <X11/Xutil.h>
41 #include <X11/keysym.h>
44 # include <X11/SGIScheme.h> /* for SgiUseSchemes() */
49 # include <X11/Xmu/Error.h>
51 # include <Xmu/Error.h>
56 #include "screenhack.h"
61 # define isupper(c) ((c) >= 'A' && (c) <= 'Z')
64 # define _tolower(c) ((c) - 'A' + 'a')
73 static XrmOptionDescRec default_options [] = {
74 { "-root", ".root", XrmoptionNoArg, "True" },
75 { "-window", ".root", XrmoptionNoArg, "False" },
76 { "-mono", ".mono", XrmoptionNoArg, "True" },
77 { "-install", ".installColormap", XrmoptionNoArg, "True" },
78 { "-noinstall",".installColormap", XrmoptionNoArg, "False" },
79 { "-visual", ".visualID", XrmoptionSepArg, 0 },
80 { "-window-id", ".windowID", XrmoptionSepArg, 0 },
84 static char *default_defaults[] = {
86 "*geometry: 600x480", /* this should be .geometry, but nooooo... */
88 "*installColormap: false",
94 static XrmOptionDescRec *merged_options;
95 static int merged_options_size;
96 static char **merged_defaults;
101 int def_opts_size, opts_size;
102 int def_defaults_size, defaults_size;
104 for (def_opts_size = 0; default_options[def_opts_size].option;
107 for (opts_size = 0; options[opts_size].option; opts_size++)
110 merged_options_size = def_opts_size + opts_size;
111 merged_options = (XrmOptionDescRec *)
112 malloc ((merged_options_size + 1) * sizeof(*default_options));
113 memcpy (merged_options, default_options,
114 (def_opts_size * sizeof(*default_options)));
115 memcpy (merged_options + def_opts_size, options,
116 ((opts_size + 1) * sizeof(*default_options)));
118 for (def_defaults_size = 0; default_defaults[def_defaults_size];
121 for (defaults_size = 0; defaults[defaults_size]; defaults_size++)
123 merged_defaults = (char **)
124 malloc ((def_defaults_size + defaults_size + 1) * sizeof (*defaults));;
125 memcpy (merged_defaults, default_defaults,
126 def_defaults_size * sizeof(*defaults));
127 memcpy (merged_defaults + def_defaults_size, defaults,
128 (defaults_size + 1) * sizeof(*defaults));
130 /* This totally sucks. Xt should behave like this by default.
131 If the string in `defaults' looks like ".foo", change that
136 for (s = merged_defaults; *s; s++)
139 const char *oldr = *s;
140 char *newr = (char *) malloc(strlen(oldr) + strlen(progclass) + 3);
141 strcpy (newr, progclass);
149 /* Make the X errors print out the name of this program, so we have some
150 clue which one has a bug when they die under the screensaver.
154 screenhack_ehandler (Display *dpy, XErrorEvent *error)
156 fprintf (stderr, "\nX error in %s:\n", progname);
157 if (XmuPrintDefaultErrorMessage (dpy, error, stderr))
160 fprintf (stderr, " (nonfatal.)\n");
165 MapNotify_event_p (Display *dpy, XEvent *event, XPointer window)
167 return (event->xany.type == MapNotify &&
168 event->xvisibility.window == (Window) window);
173 extern void pre_merge_options (void);
177 static Atom XA_WM_PROTOCOLS, XA_WM_DELETE_WINDOW;
179 /* Dead-trivial event handling: exits if "q" or "ESC" are typed.
180 Exit if the WM_PROTOCOLS WM_DELETE_WINDOW ClientMessage is received.
183 screenhack_handle_event (Display *dpy, XEvent *event)
185 switch (event->xany.type)
191 XLookupString (&event->xkey, &c, 1, &keysym, 0);
197 else if (! (keysym >= XK_Shift_L && keysym <= XK_Hyper_R))
198 XBell (dpy, 0); /* beep for non-chord keys */
206 if (event->xclient.message_type != XA_WM_PROTOCOLS)
208 char *s = XGetAtomName(dpy, event->xclient.message_type);
209 if (!s) s = "(null)";
210 fprintf (stderr, "%s: unknown ClientMessage %s received!\n",
213 else if (event->xclient.data.l[0] != XA_WM_DELETE_WINDOW)
215 char *s1 = XGetAtomName(dpy, event->xclient.message_type);
216 char *s2 = XGetAtomName(dpy, event->xclient.data.l[0]);
217 if (!s1) s1 = "(null)";
218 if (!s2) s2 = "(null)";
219 fprintf (stderr, "%s: unknown ClientMessage %s[%s] received!\n",
233 screenhack_handle_events (Display *dpy)
235 while (XPending (dpy))
238 XNextEvent (dpy, &event);
239 screenhack_handle_event (dpy, &event);
245 pick_visual (Screen *screen)
248 /* If we're linking against GL (that is, this is the version of screenhack.o
249 that the GL hacks will use, which is different from the one that the
250 non-GL hacks will use) then try to pick the "best" visual by interrogating
251 the GL library instead of by asking Xlib. GL knows better.
254 char *string = get_string_resource ("visualID", "VisualID");
258 for (s = string; *s; s++)
259 if (isupper (*s)) *s = _tolower (*s);
261 if (!string || !*string ||
262 !strcmp (string, "gl") ||
263 !strcmp (string, "best") ||
264 !strcmp (string, "color") ||
265 !strcmp (string, "default"))
266 v = get_gl_visual (screen); /* from ../utils/visual-gl.c */
274 return get_visual_resource (screen, "visualID", "VisualID", False);
278 /* Notice when the user has requested a different visual or colormap
279 on a pre-existing window (e.g., "-root -visual truecolor" or
280 "-window-id 0x2c00001 -install") and complain, since when drawing
281 on an existing window, we have no choice about these things.
284 visual_warning (Screen *screen, Window window, Visual *visual, Colormap cmap,
287 char *visual_string = get_string_resource ("visualID", "VisualID");
288 Visual *desired_visual = pick_visual (screen);
292 if (window == RootWindowOfScreen (screen))
293 strcpy (win, "root window");
295 sprintf (win, "window 0x%x", (unsigned long) window);
298 sprintf (why, "-window-id 0x%x", (unsigned long) window);
300 strcpy (why, "-root");
302 if (visual_string && *visual_string)
304 if (visual != desired_visual)
306 fprintf (stderr, "%s: ignoring `-visual %s' because of `%s'.\n",
307 progname, visual_string, why);
308 fprintf (stderr, "%s: using %s's visual 0x%x.\n",
309 progname, win, XVisualIDFromVisual (visual));
311 free (visual_string);
314 if (visual == DefaultVisualOfScreen (screen) &&
315 has_writable_cells (screen, visual) &&
316 get_boolean_resource ("installColormap", "InstallColormap"))
318 fprintf (stderr, "%s: ignoring `-install' because of `%s'.\n",
320 fprintf (stderr, "%s: using %s's colormap 0x%x.\n",
321 progname, win, (unsigned long) cmap);
327 main (int argc, char **argv)
336 Window on_window = 0;
338 Boolean dont_clear /*, dont_map */;
342 pre_merge_options ();
347 /* We have to do this on SGI to prevent the background color from being
348 overridden by the current desktop color scheme (we'd like our backgrounds
349 to be black, thanks.) This should be the same as setting the
350 "*useSchemes: none" resource, but it's not -- if that resource is
351 present in the `default_defaults' above, it doesn't work, though it
352 does work when passed as an -xrm arg on the command line. So screw it,
353 turn them off from C instead.
355 SgiUseSchemes ("none");
358 toplevel = XtAppInitialize (&app, progclass, merged_options,
359 merged_options_size, &argc, argv,
360 merged_defaults, 0, 0);
361 dpy = XtDisplay (toplevel);
362 screen = XtScreen (toplevel);
363 db = XtDatabase (dpy);
365 XtGetApplicationNameAndClass (dpy, &progname, &progclass);
367 /* half-assed way of avoiding buffer-overrun attacks. */
368 if (strlen (progname) >= 100) progname[100] = 0;
370 XSetErrorHandler (screenhack_ehandler);
372 XA_WM_PROTOCOLS = XInternAtom (dpy, "WM_PROTOCOLS", False);
373 XA_WM_DELETE_WINDOW = XInternAtom (dpy, "WM_DELETE_WINDOW", False);
376 char *v = (char *) strdup(strchr(screensaver_id, ' '));
377 char *s1, *s2, *s3, *s4;
378 s1 = (char *) strchr(v, ' '); s1++;
379 s2 = (char *) strchr(s1, ' ');
380 s3 = (char *) strchr(v, '('); s3++;
381 s4 = (char *) strchr(s3, ')');
384 sprintf (version, "%s: from the XScreenSaver %s distribution (%s.)",
395 Bool help_p = !strcmp(argv[1], "-help");
396 fprintf (stderr, "%s\n", version);
397 for (s = progclass; *s; s++) fprintf(stderr, " ");
398 fprintf (stderr, " http://www.jwz.org/xscreensaver/\n\n");
401 fprintf(stderr, "Unrecognised option: %s\n", argv[1]);
402 fprintf (stderr, "Options include: ");
403 for (i = 0; i < merged_options_size; i++)
405 char *sw = merged_options [i].option;
406 Bool argp = (merged_options [i].argKind == XrmoptionSepArg);
407 int size = strlen (sw) + (argp ? 6 : 0) + 2;
410 fprintf (stderr, "\n\t\t ");
414 fprintf (stderr, "%s", sw);
415 if (argp) fprintf (stderr, " <arg>");
416 if (i != merged_options_size - 1) fprintf (stderr, ", ");
418 fprintf (stderr, ".\n");
419 exit (help_p ? 0 : 1);
422 dont_clear = get_boolean_resource ("dontClearRoot", "Boolean");
423 /*dont_map = get_boolean_resource ("dontMapWindow", "Boolean"); */
424 mono_p = get_boolean_resource ("mono", "Boolean");
425 if (CellsOfScreen (DefaultScreenOfDisplay (dpy)) <= 2)
428 root_p = get_boolean_resource ("root", "Boolean");
431 char *s = get_string_resource ("windowID", "WindowID");
433 on_window = get_integer_resource ("windowID", "WindowID");
439 XWindowAttributes xgwa;
440 window = (Window) on_window;
441 XtDestroyWidget (toplevel);
442 XGetWindowAttributes (dpy, window, &xgwa);
443 cmap = xgwa.colormap;
444 visual = xgwa.visual;
445 visual_warning (screen, window, visual, cmap, True);
449 XWindowAttributes xgwa;
450 window = RootWindowOfScreen (XtScreen (toplevel));
451 XtDestroyWidget (toplevel);
452 XGetWindowAttributes (dpy, window, &xgwa);
453 cmap = xgwa.colormap;
454 visual = xgwa.visual;
455 visual_warning (screen, window, visual, cmap, False);
459 Boolean def_visual_p;
460 visual = pick_visual (screen);
462 if (toplevel->core.width <= 0)
463 toplevel->core.width = 600;
464 if (toplevel->core.height <= 0)
465 toplevel->core.height = 480;
467 def_visual_p = (visual == DefaultVisualOfScreen (screen));
474 cmap = XCreateColormap (dpy, RootWindowOfScreen(screen),
476 bg = get_pixel_resource ("background", "Background", dpy, cmap);
477 bd = get_pixel_resource ("borderColor", "Foreground", dpy, cmap);
479 new = XtVaAppCreateShell (progname, progclass,
480 topLevelShellWidgetClass, dpy,
481 XtNmappedWhenManaged, False,
483 XtNdepth, visual_depth (screen, visual),
484 XtNwidth, toplevel->core.width,
485 XtNheight, toplevel->core.height,
487 XtNbackground, (Pixel) bg,
488 XtNborderColor, (Pixel) bd,
490 XtDestroyWidget (toplevel);
492 XtRealizeWidget (toplevel);
493 window = XtWindow (toplevel);
497 XtVaSetValues (toplevel, XtNmappedWhenManaged, False, 0);
498 XtRealizeWidget (toplevel);
499 window = XtWindow (toplevel);
501 if (get_boolean_resource ("installColormap", "InstallColormap"))
503 cmap = XCreateColormap (dpy, window,
504 DefaultVisualOfScreen (XtScreen (toplevel)),
506 XSetWindowColormap (dpy, window, cmap);
510 cmap = DefaultColormap (dpy, DefaultScreen (dpy));
517 XtVaSetValues (toplevel, XtNmappedWhenManaged, False, 0);
518 XtRealizeWidget (toplevel);
523 XtPopup (toplevel, XtGrabNone);
526 XtVaSetValues(toplevel, XtNtitle, version, 0);
528 /* For screenhack_handle_events(): select KeyPress, and
529 announce that we accept WM_DELETE_WINDOW. */
531 XWindowAttributes xgwa;
532 XGetWindowAttributes (dpy, window, &xgwa);
533 XSelectInput (dpy, window,
534 xgwa.your_event_mask | KeyPressMask | ButtonPressMask);
535 XChangeProperty (dpy, window, XA_WM_PROTOCOLS, XA_ATOM, 32,
537 (unsigned char *) &XA_WM_DELETE_WINDOW, 1);
543 XSetWindowBackground (dpy, window,
544 get_pixel_resource ("background", "Background",
546 XClearWindow (dpy, window);
549 if (!root_p && !on_window)
550 /* wait for it to be mapped */
551 XIfEvent (dpy, &event, MapNotify_event_p, (XPointer) window);
554 srandom ((int) time ((time_t *) 0));
555 screenhack (dpy, window); /* doesn't return */